Framework overlap

Does ISO 27799 cover NIS2 Directive Implementing Acts?

You hold ISO 27799 and have been told to do NIS2 Directive Implementing Acts. Here is how much overlaps, control by control.

63% of NIS2 Directive Implementing Acts you already have

ISO 27799 already covers about 63% of NIS2 Directive Implementing Acts, leaving 3 of 8 controls as genuinely new work.

Already covered 1 Likely covered 4 New work 3

What is genuinely new work

Nothing in ISO 27799 reaches these. This is the list to scope.

NIS2I-1
Implementing Regulation 2024/2690 Scope, Annex I Measures, and ENISA Technical Guidance
NIS2I-4
Supply Chain Security, Acquisition Development, and Effectiveness Assessment
NIS2I-8
Sector-Specific Requirements - Cloud Providers and Managed Service Providers (Articles 7, 10)
Show the 5 you already have
NIS2I-5
Cyber Hygiene, Training, Cryptography, and Human Resources Security
NIS2I-2
Policy, Risk Management, and Roles + Responsibilities
NIS2I-3
Incident Handling Policy, Reporting Significance Criteria, and Business Continuity
NIS2I-6
Access Control, Asset Management, and Physical Security
NIS2I-7
Network Security, Logging, Monitoring, and Vulnerability Handling

How this is calculated

Already covered means a mapping runs from a control in ISO 27799 to that control. Likely covered means no direct mapping exists but both frameworks map to the same control in a third standard. New work means neither. We keep those separate rather than adding them into one friendlier number, because blending them would present a two-hop inference as a verified fact.

Coverage is not symmetric. Run it the other way and you will get a different number; both are correct.

From 332,959 cross-framework control mappings across 723 frameworks, 531 of them verified against their source documents. It does not tell you that you are compliant: a mapped control means the two standards ask for the same thing, not that you have done it.

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